Vertical Farming

Start with the crop and the buyer, not with the equipment.

• Fast, light, high-value crops suit stacked growing: microgreens, lettuce, herbs, edible flowers and some strawberries.
• Cycle times: microgreens 8 to 12 days, lettuce 30 to 40 days, herbs 4 to 6 weeks.
• Ask three local buyers what they buy weekly, at what price and in what pack.
• Rank crops by income per tray per week.

Activity. Build a demand table with three buyers, quantities and prices and choose three crops.

Standard to meet. Support the choice with buyer numbers and cycle times.

Choose a system you can run reliably.

• Deep-water culture floats plants on aerated nutrient solution; nutrient film technique sends a thin stream over roots; ebb and flow floods and drains trays.
• Aeroponics saves the most water but fails fastest if a pump stops.
• Plan for failure: a battery or generator for pumps, alarms, and a manual watering routine.
• Keep a spare pump and tubing.

Activity. Draw your layout and write a fail-safe plan.

Standard to meet. Label the parts in the layout, and cover power and pump failure in the plan.

Light is usually the largest running cost.

• Light strength is measured as photosynthetic photon flux density (PPFD, the usable light reaching the plants). Many leafy greens do well at 150 to 250 micromoles per square metre per second.
• White full-spectrum LEDs work for most beginners.
• Hang lights 20 to 40 cm above the canopy and raise as plants grow.
• Use timers; 12 to 16 hours of light a day for most leafy crops.

Activity. Set a light schedule and calculate daily light energy cost.

Standard to meet. Schedule and cost are correct and recorded.

Plants take nutrients dissolved in water, so water quality is crop quality.

• Measure pH (about 5.8 to 6.2 for lettuce) and conductivity (about 1.2 to 1.8 mS per cm) every day.
• Add nutrients slowly and test again after 30 minutes.
• Change the solution on a schedule and keep it covered from light to prevent algae.
• Never mix concentrated nutrients together before dilution.

Activity. Keep a 14-day reading sheet.

Standard to meet. Log has daily pH, conductivity, temperature and actions.

Indoor air is warm and humid, which is ideal for disease.

• Keep humidity near 50 to 70 per cent and airflow gentle but constant.
• Wash hands, clean tools, use a footbath or shoe change and quarantine new plants.
• Remove diseased plants at once; sanitise trays between cycles.
• Wash and pack produce in a clean area; keep a harvest record.

Activity. Write a hygiene and cleaning schedule.

Standard to meet. Schedule has daily, weekly and between-crop tasks.

Measure efficiency to compare crops and decide what to scale.

• Yield per square metre of floor area counts all levels.
• Water use is often much lower than field growing; energy per kg is the weak point.
• Track weight per tray, losses and sales.
• Compare cycles to find improvements.

Activity. Calculate yield, energy and water per kg for your pilot.

Standard to meet. Calculate correctly, with units.

A viable unit needs steady sales.

• Cost lines: racks, lights, pumps, space rent, power, water, seeds, nutrients, labour, packing and transport.
• Sell direct to restaurants and shops, and consider weekly subscription boxes.
• Break-even kilograms per week = weekly cost / margin per kg.
• Test price and yield changes.

Activity. Build a weekly break-even sheet.

Standard to meet. Calculate break-even and compare it with output.

Run long enough to see repeats.

• Set weekly targets for yield, losses and energy.
• Log every problem and fix.
• Hold a review at day 30, 60 and 90.
• At day 90 decide: scale, change crop or stop.

Activity. Write the day-90 decision memo.

Standard to meet. Write a memo that uses real numbers and a clear decision.

L1: learner can name crops. Focus module: Choosing crops that pay (Understand, 3 h). Start with the crop and the buyer, not with the equipment. Key points: Fast, light, high-value crops suit stacked growing: microgreens, lettuce, herbs, edible flowers and some strawberries. Cycle times: microgreens 8 to 12 days, lettuce 30 to 40 days, herbs 4 to 6 weeks. Ask three local buyers what they buy weekly, at what price and in what pack. Rank crops by income per tray per week.

Speaker notes. Teach: open with the worked example. Three buyers want 20 kg of basil per week at 300 INR per kg. A basil tray gives 1.2 kg every 5 weeks, so about 85 trays in rotation are needed. Then set the activity: Build a demand table with three buyers, quantities and prices and choose three crops. Mark against the standard: Support the choice with buyer numbers and cycle times. Check at this level: Which crops suit? Model answer: Leafy greens, herbs, microgreens.

L2: learner knows system types. Focus module: Growing systems and fail-safes (Understand, 4 h). Choose a system you can run reliably. Key points: Deep-water culture floats plants on aerated nutrient solution; nutrient film technique sends a thin stream over roots; ebb and flow floods and drains trays. Aeroponics saves the most water but fails fastest if a pump stops. Plan for failure: a battery or generator for pumps, alarms, and a manual watering routine. Keep a spare pump and tubing.

Speaker notes. Teach: open with the worked example. A 4-level ebb-and-flow rack uses a 40 L reservoir and a timer. When the pump fails at night, a battery alarm wakes the grower within 10 minutes and the crop survives. Then set the activity: Draw your layout and write a fail-safe plan. Mark against the standard: Label the parts in the layout, and cover power and pump failure in the plan. Check at this level: Biggest risk? Model answer: Pump or power failure.

L3: learner can set schedules. Focus module: Light schedules and cost (Apply, 4 h). Light is usually the largest running cost. Key points: Intensity is measured as photosynthetic photon flux density; many leafy greens do well at 150 to 250 micromoles per square metre per second. White full-spectrum LEDs work for most beginners. Hang lights 20 to 40 cm above the canopy and raise as plants grow. Use timers; 12 to 16 hours of light a day for most leafy crops.

Speaker notes. Teach: open with the worked example. A 4-tray rack with 100 W of LEDs for 14 hours uses 1.4 kWh a day. At 8 INR per kWh, that is 11.2 INR per day for the rack. Then set the activity: Set a light schedule and calculate daily light energy cost. Mark against the standard: Schedule and cost are correct and recorded. Check at this level: Why LEDs? Model answer: Efficient, less heat.

L4: learner can run a tray. Focus module: Water and nutrients (Apply, 4 h). Plants take nutrients dissolved in water, so water quality is crop quality. Key points: Measure pH (about 5.8 to 6.2 for lettuce) and conductivity (about 1.2 to 1.8 mS per cm) every day. Add nutrients slowly and test again after 30 minutes. Change the solution on a schedule and keep it covered from light to prevent algae. Never mix concentrated nutrients together before dilution.

Speaker notes. Teach: open with the worked example. A reading of pH 7.2 is corrected with a few millilitres of acid solution, then re-tested after 30 minutes and logged. Then set the activity: Keep a 14-day reading sheet. Mark against the standard: Log has daily pH, conductivity, temperature and actions. Check at this level: What pH range? Model answer: About 5.8 to 6.2 for many crops.

L5: learner can measure yield. Focus module: Climate, hygiene and food safety (Evaluate, 4 h). Indoor air is warm and humid, which is ideal for disease. Key points: Keep humidity near 50 to 70 per cent and airflow gentle but constant. Wash hands, clean tools, use a footbath or shoe change and quarantine new plants. Remove diseased plants at once; sanitise trays between cycles. Wash and pack produce in a clean area; keep a harvest record.

Speaker notes. Teach: open with the worked example. Grey mould appears at 85 per cent humidity. A small fan and a dehumidifier bring humidity to 65 per cent within a day and the outbreak stops. Then set the activity: Write a hygiene and cleaning schedule. Mark against the standard: Schedule has daily, weekly and between-crop tasks. Check at this level: Why hygiene? Model answer: Prevent disease.

L6: learner can lead a farm shift. Focus module: Unit economics and break-even (Evaluate, 4 h). A viable unit needs steady sales. Key points: Cost lines: racks, lights, pumps, space rent, power, water, seeds, nutrients, labour, packing and transport. Sell direct to restaurants and shops, and consider weekly subscription boxes. Break-even kilograms per week = weekly cost / margin per kg. Test price and yield changes.

Speaker notes. Teach: open with the worked example. Weekly costs of 9,500 INR and a margin of 110 INR per kg give break-even of about 86 kg a week. The unit grows about 8 kg a week (40 kg every 5 weeks), so it needs either more levels, a higher price or lower costs. Then set the activity: Build a weekly break-even sheet. Mark against the standard: Calculate break-even and compare it with output. Check at this level: What is break-even? Model answer: Volume covering costs.

L7: learner can audit a plan. Focus module: Ninety-day pilot and decision (Create, 3 h). Run long enough to see repeats. Key points: Set weekly targets for yield, losses and energy. Log every problem and fix. Hold a review at day 30, 60 and 90. At day 90 decide: scale, change crop or stop.

Speaker notes. Teach: open with the worked example. By week 12 the pilot sells 62 kg of herbs, loses 6 per cent to disease and cuts energy per kg by 12 per cent after lights are moved closer. Then set the activity: Write the day-90 decision memo. Mark against the standard: Write a memo that uses real numbers and a clear decision. Check at this level: When to review? Model answer: Day 30, 60 and 90.